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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a247141a439f792d001b7b05ecac83e8709be6a37d61f18525345fbf0085c69a' 
  AND token = 'Vp4CuOVTc6ccTeG7Svn1cw6jGQwSkOCdc4iHFk8qYXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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