SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aec8d92087d3f0193a2cef0569b78981e4262e13f6c12bef6e62e32e725e319d' 
  AND token = 'rYlhzjG788lY9ZyMDO2VwPmNV/9DHZqAKVLjGpa4zXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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