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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ae821ab66c1c6b08cf121a25df2881951844ebf226bc3ccfa7ea9ff17d1607f' 
  AND token = 'ZbOSMVNzcHcIAhk8s4bdiJKcpGf10Efa+VCt2RTHpOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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