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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20435049271ebb3017d646f78ad371431837dc7e0b343e0a0f679976b23d5299' 
  AND token = 'gzgps6UVpvoFvLcARHe6gZv3UvME49wd535zlALFxJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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