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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd992fbf0ebf16a2291d99ee7a28f6ea5d1e7aa3233018fcf579185a2d7a7a599' 
  AND token = '9Myl7Iedo+7RtgcWXRv/t9kiQyEFZnr3dj1nZMPiMrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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