SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a3854ee6678c5466b6b54b9ccd1732df242379803e6a527c6bcadae9354d98f' 
  AND token = 'RjqWbdv3gJenZlLXOc/3TRzYninzvmXh7PxsmCLOYgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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