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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97ca280501b2b49ced1055fdc1ecd59e673a308e70eadfb2b58acff3d32018ff' 
  AND token = 'EEnhOXam2x3mY8hv4HOYODfs+UmGjOB5/xdQkpaidKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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