SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2746c08329605a4f8d0dfb320c64c10a689e646369b4e0009f68e47ea8965ea2' 
  AND token = 'CCohIx89/lqnOnSm0SkfmY50wJ72zUqPhfqZGDpFx5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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