SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97530253932b49ee9e563abba2ec295d6008fef1515f6df6e3e2a8848af44781' 
  AND token = 'tjsMP2Tx3zn6hi1ryKFm7uVi/1Nh+ST7lgXkWZ5l2sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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