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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ac735998edb31243d44da592b803ddeec0696df07075b8638ea6c38470226da' 
  AND token = '54inKblWQuiZqCanAkZx5qQqNqg8srPh6bXo9ZhgWLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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