SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f08f0ca3937fb3914578cf426642c8f5a1a91b8d16cd69ea535ac6516ea2c99' 
  AND token = 'FRwAyhph0s5L1DbdJY+W6cS046Q38zgHzLWlYN/2kvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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