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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03e12d1f63aec7c69515e7f89348fe30b5ba0fc620444d44e5e7324261a2ec5e' 
  AND token = 'fYT51Ku3Zn5Rj7ce9PMYc8ZPum3LQsm0hV4X87IK2zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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