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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '777da9114fe61be4a96d24310a672ff5905b83935a114258d58a9f2c92d25d93' 
  AND token = 'PRrlQcy5zlrHhvY3lxCIsiI1sm69b6XiVKSx6PWxvF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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