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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ff9d8e5a030008fa33bed714787e7f70e32a14093cf03ef484003d586c76bbc' 
  AND token = '7VW9ddO3IXX+U3u1djMFMmyCgSzjVzWMaCEmnXQto+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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