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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c08ea9b07bfefc2072eaaa254ad6665d612c3cec7482549eb36a4a34912fa00' 
  AND token = '7Vj1YiB84mBPsRX8QnsQ66RCN2lfP9k8qXLfe3tlMeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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