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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23a02f2726b32b07415ec214edb70bc5a9ec213fc73092d461755b461a9625b4' 
  AND token = 'jTYh2QIkKIy5Yb/5rrYU2BpYmh6dvCFDt3FF7gYgeqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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