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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ff560e36c79d29130b7a4e118eed35eb111d0cedecb76bca98252f56489a83b' 
  AND token = 'uCCH057YA0bCe3A2sV5TVMGWVbNSNiYz2PLQJQKQZl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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