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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19406a11c386cc159e5c194253805555457f59a39256afb3902c89e6f4167253' 
  AND token = 'jJYD9Jo4pS3IWYpLZ6HfcojLUS48SSvrD+t0KUprtzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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