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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6afcc67843f0494e912b94bad41786e8a880ad7879dfb275c113d1c83291e6e' 
  AND token = 'gSeAm8UXIPpA6AXExYQpFR4yfdE0+0Ii+OZ7VbgggcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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