SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dea5dd22f15eb4b8752db227c0c768dafe9813608053f38dc85099d50f5c1aeb' 
  AND token = '94lhtnE3WIJztplGG+033UFXnw5Cg2sB4pPucJYvU8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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