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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '419b81bb976c25096ce05465caf7f6896d6b624a69ade53376dc15680b3cfc12' 
  AND token = 'hAByTJgSxaaaITlr5fTokQ0VcB+bnW0VdiTZgIXwecw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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