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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '783d731af6eb10e3ef3d7eb2f0ada01161e312c0762366a60d10a6589cb9bc3c' 
  AND token = 'KJB+SlKmhw+0LZY/Wc2mqLU9JkMLKCtwot3mNprkyqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}