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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fbadb3a2009e2c71fb33de0590fc035902b4e23551894e3fedbfee651015b27' 
  AND token = 'AF2OwGka3KJgUVf9eU41f6jMMjgDUWYk4DNS7gbfYEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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