SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9048d82d5b3b9e7af4f85b46d35d734093d0a7db83a42d120f6fe69fbdfd8197' 
  AND token = 'PEbbA7oACgQGCmMqxOS25TpO7y+OPVCXCrrwqHCuJlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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