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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9a3ea9dfed11dee5fb92a39f809e0ee4ff1322b56db833028c1c7f0fc44183a' 
  AND token = 'GeoGhb0sEZZy9nGj7DM6MiW8Yne/mo3/giG80J/J6Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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