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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4e4628690fb06cdf400c8b845c3df604257e2acb79d36b93cbffe3178cda283' 
  AND token = 'dguBboNDAPonpjM1zLxtNzzhw1B3d/NSH5tQsIfcS1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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