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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '185d8051902b037d415bf09c56ff190b7d63712fd99ea39b32ca756ee0ca5547' 
  AND token = 'Y0A0SIH7Et1WPov8mBBlDrCDXiDRr1byApBkbKJN7Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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