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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f24b37cf78f443a37c7ea0e4abac81e66631ad56c56aaab820a0ff246b7c91a' 
  AND token = '9KsPV44c2A158szmTgibjOTsL/Kla/QVZRoawdaQGMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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