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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd62cd804378c3ce444911b8292cf492526d4c91d4228571a2141507609b01ed7' 
  AND token = 'H2roML4a8k7PVKFjX/Lcf0lq6+9ez4gfSoi/3lWWm9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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