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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffed4df224cccf9fb2e24b5b0005da0599cdc4c6937913a4bbc0398029211792' 
  AND token = 'ZTF0NSpyxtEr/vdwAIF8xvJNNhQ+NaeJmQfuZTexlNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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