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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a047026d46cfe067ae8b15119eb73ca5895195bf4f724212936f9f1f642e5ab5' 
  AND token = 'canHud5m0ei4SdM16oh0bF3K2Sz6fh6sZcr4ywRQ+M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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