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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed6e8349239f24a7672deebb951f62d2af300e32039de64509bdab1f98a56d71' 
  AND token = 'zIZmmfb2QW6Z6pI5rCdG8zz9iIsjNS0tNoficI+djqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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