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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc9233730200be19c432ae53e66d48aec38cba867f7d7198a8d6fc05faf11d5e' 
  AND token = 'qBVkH6VE5zcWY/yN9WMuAJnIfN0NxIHYHxTo38mVsoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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