SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f3b5a71c4132b5b4d293dc875cdaf767215022626b3021146daeb3a5cfe61ff' 
  AND token = 'qImu+nDpWPdXehPKSmAF8j2rkQBI2+F7LBcPWC+l9qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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