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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fbdbdf2a9dd92e4a5d6c45633d3952a98a13372be70ed03fe973c0cf78417ab' 
  AND token = 'KY4eD8vFCeeF7iXzVzlKtovSSKAMdeYAzCQHaqPlovU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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