SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b91f745e763b4f900ab51dd3f3d182828cb20aef0b1fdab9d2565f790927acd' 
  AND token = 'CfxmNfGuzpvnJEhMZ8M+dksHpSN+JTpBwtiwmrdFfEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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