SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a6266d63c028a0c1f89126e5d77f97cea6b7a44b7df4cf893450cc701afec5f' 
  AND token = 'UAtGREhjITbJhvGwunwSWPJA8S5WRsgmq4Y8sCyBHTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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