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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '375be8adbb8861ad7efa5ee9af546fb69e52d1a5637ad9478735eb1aea6685a9' 
  AND token = 'DIeJVXuhn6syxKftyHvP+ZwiH6WSW4nZICfUopgVU5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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