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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '535ed106cc1b79b98321e55893eb903b1f31aab431417de1ac11ca0fa40c22f3' 
  AND token = 'bLkaVHhWYGNB0Ivdc3W2CxEcIlSz6/Fiyn6Aay+J/o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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