SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fb4e0759a78fcd58c5d4ffdef3bf2ad2d95b3051d4abada57f0166806d36249' 
  AND token = 'Ztym3IUgF0KZJyjHVwbwNMyYpIrn3zsWRmTzYEj+M4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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