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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ceb3669579e318e96caf198260b7c0ef6e4f19302c496f23bb2ce30350adf5e4' 
  AND token = 'FtZYjlrmLIAO2GeED1LP2X2GDkK+xs2Z7AV1r0M5V3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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