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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70db69d57f80c22fb9083cb848b05ad1d824d04c2cbffcdabdc641b2a1623fb2' 
  AND token = 'ITtVZiGcwfI7vHtzBkDl1+kKA8HNzh7cV2W0sFijVAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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