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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f94925d6b725b5a3ed1bcaa4a08bafbc2f832b3cb81ade9ea73d49dd7200716a' 
  AND token = 'OAu2278D9QkaLcn65/CNIz75pdK9bhH9uNPt4XOY0WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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