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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '832408746fa2e63b56e5655a69c052542ce8f5397448aa6a5996c10a76924fbf' 
  AND token = 'e6NJavKaD1NxapWuziITawAs0SCVbMUYsjr6OOQoxXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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