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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8eaca58490a346c548a8371bfabab2d16462e88f6b9ae7614953b822f2f08c1' 
  AND token = '8qjLSG8cLcrAWxAH3QNrSfwB+zm4k54L1rfs/R29cQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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