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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8014ffbd03c1659d0bebca794b7ba547fb8a762097b28c3a44d401a01976e680' 
  AND token = '4RddyiKk8G8RwuItF0VNzMlLzRKpINouxZz5vkh2NQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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