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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68d45b4dbc2dd11e831a780825470b816913e3743e7091dcd471a4a70b1e0a68' 
  AND token = '4NK9/4MM83qpTcLrByQUb79BG1Hn2pthqCfZuI0q1t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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