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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c41a957bf3213434e449fe69cc4baa93f7f1238cfdba0411a690b1fc189388a' 
  AND token = 'LHHgTo7FnfJBO9T0BwyFmyFNw0G0lVsmy1MyMEySP28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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