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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c770f4bf47aa437e9e1d4bccb434bacd9138f61011a6023561e5e20e306e1701' 
  AND token = 'ZlJ5TicWcnwMAyEf8zmKre5PekQMR9UU5Jg7rrtqviA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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