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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52741105995c41e86a06389e5b10a641c552aba6d6cea54e1bbd0524f5823b6e' 
  AND token = '/3cXvsYwJWebFUDHvidEBmy5MdUGawPLjDu1ubpf5lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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