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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cff290161de9472c7a019bb0f0fd1b480b55876cbf8e66278920bf86aa665ecb' 
  AND token = 'kxr6xvuIL4IJVm/3LtQeZ5Nx8W/pjfKJnL7ukmSSL6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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