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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3cf829baf1516ca97519c0ca9d902ea31d0c487c1117ab4ec3d81d868bda0fc' 
  AND token = 'syEnx/IfqMgZnzcPXsiH2x7zj5+qwWxfck63qoVXiFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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