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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9861167e82904b80c14c029d65891b0b97df88037f430e92dea4e24b1017a9a' 
  AND token = '6kv0XznDo4khCpeI38kU5dFcyOW6E9jlX91T/8hnV4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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