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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7470dbeec2935b4eff78e9902e21fecb1b3a8e2a91af4fe14f1798b8ebb16379' 
  AND token = '3YHiG2ual1BhZj39j5aGatd+SR0KBktk8tSV56Y4UZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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