SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0658074c13a458a2ca79ca4b4067195f2a00672b3c8f6bbd549c5b68f195ce84' 
  AND token = 'sxpJMvCo9A1oZPkvyRLmSCgMJS5bB6yLTcoYQKNGV+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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