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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff6bde5abd6adbf8cb64695789e523fe91bca3af897062c5869c2821f1248daf' 
  AND token = 'bdKHaE51fBvL33k8EH1EmMIe+/NPEFcMbxnpClzLbSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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