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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c63a32d9e831adce70a696100180f9d94b5c9a78293b1cb728c21fd2efe01512' 
  AND token = 'a1JaZY5zXkrfthaMtmObUL8TwbzV5L+eF6zR5SSNimc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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