Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82eb0b3c53ad7aef56537558496252e0fd3aaa189142ad216d3ee415851ad03c' 
  AND token = 'rRt+c1DEviOmLwrdG5mTkNWIX6bX+Pjd6LS9wdSBY/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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