SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dccf35bd98b4e76faeb21008ee05e6b777d7103fcf52efb3239da935ac24c190' 
  AND token = 'iw8AYG9Nei/AF5+rG2Vfb/hBTMQ9zKE1aVUpKAVv4QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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