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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '114b37e3551a6b88a93fcdae93496b22ab40f145c70cd46d73d0419e5aef97d0' 
  AND token = 'GEc3HYOle1p778Ca0GtRXgToJo0o/o6hutvfCXbcew4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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