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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b3e514f96b5345bb990e5934eeba2bd570925cc8c5a7b58236eb6ae81d67e52' 
  AND token = '5M/Yxu6L/TnOMcSEriKDJrY1WCDIIQnFQ/JcSu0MFio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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