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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fe84acc6bb668a9503167e5b968a4799a386b5a07351efd5ab1c02b6d12d57f' 
  AND token = 'Gg36Bg+ExRB2yuGs7cx4tny4fqTERsZg+E5JpF9xqy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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