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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4414d6edce033d9aa5f1119e451f1664da715ea0f0ceff6899cc05a265a8a02' 
  AND token = 'hRtwXHcoIoL09NV5HTsFJzaQpn3ApDLx3IpIrmIvwUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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