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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7ade1fcd4146c8bbcc4a6b3a8fae7f20b56b3c359b85690d3b9c69025184ba3' 
  AND token = 'KpHYuvuguRTzk8t2m2EcILTg214OSd3VZ9QE4HRLM6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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