SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3a99be53cb1e9f6c9d6107d64f869a237d8fbce88225f78104ed4285137f9a7' 
  AND token = 'MCZSPxwWH8+hyFTt3jzUB+qZozcHJGsk3ljNBbJr98c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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